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BEREA (92.3 The Fan) – Cleveland Browns running back Trent Richardson and tight end Jordan Cameron did not participate in Thursday’s OTA session and will miss additional time with muscle strains.

Richardson has a lower leg strain – more specifically a pulled muscle in his shin which happened earlier in the week according to head coach Rob Chudzinski. He may miss the team’s mini camp which is scheduled for June 4-6.

“It’s precautionary, we’re holding [Richardson] out,” Chudzinski said. “We’ve got minicamp in a week and a half. He may miss that. I’m not sure we’ll just play it day by day.”

Richardson’s injury might explain the roster shuffle the last few days involving running backs including the addition of Brandon Jackson despite still having Chris Ogbonnaya and Montario Hardesty on the depth chart.

Jackson spent the last 2 seasons with the Browns but played in just 2 games in 2012 after missing 2011 with a toe injury.

“With Brandon, I always felt like you can’t have enough good running backs,” Chudzinski said. “He’s a proven guy who has had production in the league. He has been able to have good production catching the ball as well. Just bringing in another guy who was available at that position from my experience, you can never have enough good running backs.”

Cameron has a groin injury and like Richardson will need time to heal.

“We’re being more precautionary with these type of things and we’ll wait and see,” Chudzinski said.

With Cameron out, Gary Barnidge, Kellen Davis and Brad Smelly all took advantage of the additional reps Thursday. Barnidge caught a long touchdown over the shoulder and also made 2 nice catches on the sideline.